课程: Programming Foundations: Design Patterns

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Solution: The Decorator pattern

Solution: The Decorator pattern

课程: Programming Foundations: Design Patterns

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Solution: The Decorator pattern

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(funky upbeat music) - Here's our solution for creating pizzas with the decorator pattern. In this solution, we've closely followed the decorator pattern structure. First, we define a Pizza class that has a getDescription method and an abstract cost method. Then we added ThinCrustPizza and ThickCrustPizza concrete subclasses, which both extend the Pizza class. We also created a ToppingDecorator class that, again, following the structure of the decorator pattern, extends the Pizza abstract class. Note that ToppingDecorator has a property Pizza and an abstract method getDescription. Extending the ToppingDecorator, we've created classes Cheese, Olives, and Peppers for our toppings. We'll pass in the pizza the toppings are decorating and the constructor, and store the pizza in the Pizza variable that's inherited from the ToppingDecorator class. The cost method in the pizza classes return the cost of the basic thin or thick…

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